MIL-DTL-82646B (OS)
3.3.2 Thickness. The film thickness shall be as specified by the procuring activity (see 6.2) and shall be
specified in increments of 0.0010 inch (in.) (0.025 millimeters (mm)). The tolerance shall be ± 20 percent
of the specified thickness.
3.4 Chemical and physical properties.
3.4.1 Chemical compatibility. The plastic film shall be compatible with each of the following materials
when tested in accordance with 4.6.2:
a. A mixture consisting of 75 percent nitroglycerin solvent, 1 to 2 percent 2-nitrodiphenylamine,
and 24 percent nominal triacetin.
b. Ammonium perchlorate
c. HMX
3.4.2 Solvent compatibility. The plastic film shall be capable of meeting 75 percent of each mechanical
property value specified in 3.4.5 and shall reveal no adverse visual defects after treatment in accordance
with 4.6.3 with any of the following solvents:
a. 75 percent nitroglycerin solvent as in 3.4.1 (a)
b. Acetone
c. Diethyl ether
3.4.3 Permeability. When specified in the contract (see 6.2), the water vapor permeability shall not exceed
9.3 grams per square meter (g/m) per 24 hours for 0.0040 in. (0.1000 mm) thick film material.
3.4.4 Electrical resistivity. The electrical resistivity shall not exceed 30,000 ohms per square inch as
determined in accordance with 4.6.5.
3.4.5 Tensile strength, breaking strength and elongation. The film tensile strength shall be at least 1,900
psi in the machine direction and 1,700 psi in the transverse direction. The film elongation shall be at least
200 percent in the machine direction and 180 percent in the transverse direction.
3.5 Identification.
3.5.1 Material. The film shall be marked to show the manufacturer's designation, the date of manufacture
(month and year), the specification number, and the notation "seal other side", if applicable. The
identification shall appear in continuous rows of constantly recurring symbols in the machine direction
from one end of the sheet to the other. Symbols shall be of a clearly legible contrasting color with that of
the material and shall be not less than 0.10 in. (2.5 mm) nor more than 0.50 in. (12.7 mm) high. The
symbols shall be applied by suitable means using marking fluid that is not deleterious to the film. The
marking fluid used shall be as conductive as, or more conductive than. the basic material. The marking
shall not be obliterated by normal handling or the action of water.
3.5.2 Identification sheet. An identification sheet shall accompany each roll or bundle and shall contain
specification number, manufacturer's name, manufacturer's designation, lot number, and date of
manufacture (month and year).
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business